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<a name="boost_config.cstdint"></a><a class="link" href="cstdint.html" title="Standard Integer Types">Standard Integer Types</a>
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</h3></div></div></div>
<p>
        The header <code class="literal"><a href="../../../../../boost/cstdint.hpp" target="_top">&lt;boost/cstdint.hpp&gt;</a></code>
        provides the typedef's useful for writing portable code that requires certain
        integer widths. All typedef's are in namespace boost.
      </p>
<p>
        The specifications for these types are based on the ISO/IEC 9899:1999 C Language
        standard header &lt;stdint.h&gt;. The 64-bit types required by the C standard
        are <span class="emphasis"><em>not required</em></span> in the boost header, and may not be
        supplied for all platforms/compilers, because <code class="literal">long long</code>
        is not [yet] included in the C++ standard.
      </p>
<p>
        See <a href="../../../test/cstdint_test.cpp" target="_top">cstdint_test.cpp</a> for
        a test program.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.cstdint.rationale"></a><a class="link" href="cstdint.html#boost_config.cstdint.rationale" title="Rationale">Rationale</a>
</h3></div></div></div>
<p>
        The organization of the Boost.Integer headers and classes is designed to
        take advantage of &lt;stdint.h&gt; types from the 1999 C standard without
        causing undefined behavior in terms of the 1998 C++ standard. The header
        &lt;boost/cstdint.hpp&gt; makes the standard integer types safely available
        in namespace <code class="literal">boost</code> without placing any names in namespace
        <code class="literal">std</code>. The intension is to complement rather than compete
        with the C++ Standard Library. Should some future C++ standard include &lt;stdint.h&gt;
        and &lt;cstdint&gt;, then &lt;boost/cstdint.hpp&gt; will continue to function,
        but will become redundant and may be safely deprecated.
      </p>
<p>
        Because these are boost headers, their names conform to boost header naming
        conventions rather than C++ Standard Library header naming conventions.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.cstdint.ce"></a><a class="link" href="cstdint.html#boost_config.cstdint.ce" title="Caveat emptor"><span class="emphasis"><em>Caveat emptor</em></span></a>
</h3></div></div></div>
<p>
        As an implementation artifact, certain C &lt;limits.h&gt; macro names may
        possibly be visible to users of &lt;boost/cstdint.hpp&gt;. Don't use these
        macros; they are not part of any Boost-specified interface. Use <code class="literal">boost::integer_traits&lt;&gt;</code>
        or <code class="literal">std::numeric_limits&lt;&gt;</code> instead.
      </p>
<p>
        As another implementation artifact, certain C &lt;stdint.h&gt; typedef names
        may possibly be visible in the global namespace to users of &lt;boost/cstdint.hpp&gt;.
        Don't use these names, they are not part of any Boost-specified interface.
        Use the respective names in namespace <code class="literal">boost</code> instead.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.cstdint.exact_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.exact_width_integer_types" title="Exact-width integer types">Exact-width
      integer types</a>
</h3></div></div></div>
<p>
        The typedef <code class="literal">int#_t</code>, with # replaced by the width, designates
        a signed integer type of exactly # bits; for example <code class="literal">int8_t</code>
        denotes an 8-bit signed integer type. Similarly, the typedef <code class="literal">uint#_t</code>
        designates an unsigned integer type of exactly # bits.
      </p>
<p>
        These types are optional. However, if a platform supports integer types with
        widths of 8, 16, 32, 64, or any combination thereof, then &lt;boost/cstdint.hpp&gt;
        does provide the corresponding typedefs.
      </p>
<p>
        The absence of int64_t and uint64_t is indicated by the macro <code class="computeroutput"><span class="identifier">BOOST_NO_INT64_T</span></code>.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.cstdint.minimum_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.minimum_width_integer_types" title="Minimum-width integer types">Minimum-width
      integer types</a>
</h3></div></div></div>
<p>
        The typedef <code class="literal">int_least#_t</code>, with # replaced by the width,
        designates a signed integer type with a width of at least # bits, such that
        no signed integer type with lesser size has at least the specified width.
        Thus, <code class="literal">int_least32_t</code> denotes the smallest signed integer
        type with a width of at least 32 bits. Similarly, the typedef name <code class="literal">uint_least#_t</code>
        designates an unsigned integer type with a width of at least # bits, such
        that no unsigned integer type with lesser size has at least the specified
        width.
      </p>
<p>
        The following minimum-width integer types are provided for all platforms:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            <code class="literal">int_least8_t</code>
          </li>
<li class="listitem">
            <code class="literal">int_least16_t</code>
          </li>
<li class="listitem">
            <code class="literal">int_least32_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_least8_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_least16_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_least32_t</code>
          </li>
</ul></div>
<p>
        The following types are available only if, after including &lt;boost/cstdint.hpp&gt;,
        the macro BOOST_NO_INT64_T is not defined:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            <code class="literal">int_least64_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_least64_t</code>
          </li>
</ul></div>
<p>
        All other minimum-width integer types are optional.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.cstdint.fastest_minimum_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.fastest_minimum_width_integer_types" title="Fastest minimum-width integer types">Fastest
      minimum-width integer types</a>
</h3></div></div></div>
<p>
        The typedef <code class="literal">int_fast#_t</code>, with # replaced by the width,
        designates the fastest signed integer type with a width of at least # bits.
        Similarly, the typedef name <code class="literal">uint_fast#_t</code> designates the
        fastest unsigned integer type with a width of at least # bits.
      </p>
<p>
        There is no guarantee that these types are fastest for all purposes. In any
        case, however, they satisfy the signedness and width requirements.
      </p>
<p>
        The following fastest minimum-width integer types are provided for all platforms:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            <code class="literal">int_fast8_t</code>
          </li>
<li class="listitem">
            <code class="literal">int_fast16_t</code>
          </li>
<li class="listitem">
            <code class="literal">int_fast32_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_fast8_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_fast16_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_fast32_t</code>
          </li>
</ul></div>
<p>
        The following types are available only if, after including &lt;boost/cstdint.hpp&gt;,
        the macro BOOST_NO_INT64_T is not defined:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            <code class="literal">int_fast64_t</code>
          </li>
<li class="listitem">
            <code class="literal">uint_fast64_t</code>
          </li>
</ul></div>
<p>
        All other fastest minimum-width integer types are optional.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.cstdint.greatest_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.greatest_width_integer_types" title="Greatest-width integer types">Greatest-width
      integer types</a>
</h3></div></div></div>
<p>
        The typedef <code class="literal">intmax_t </code>designates a signed integer type
        capable of representing any value of any signed integer type.
      </p>
<p>
        The typedef <code class="literal">uintmax_t</code> designates an unsigned integer type
        capable of representing any value of any unsigned integer type.
      </p>
<p>
        These types are provided for all platforms.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_config.cstdint.integer_constant_macros"></a><a class="link" href="cstdint.html#boost_config.cstdint.integer_constant_macros" title="Integer Constant Macros">Integer
      Constant Macros</a>
</h3></div></div></div>
<p>
        The following macros are always defined after inclusion of this header, these
        allow integer constants of at least the specified width to be declared: INT8_C,
        UINT8_C, INT16_C, UINT16_C, INT32_C, UINT32_C, INTMAX_C, UINTMAX_C.
      </p>
<p>
        The macros INT64_C and UINT64_C are also defined if the the macro BOOST_NO_INT64_T
        is not defined.
      </p>
<p>
        The C99 macro __STDC_CONSTANT_MACROS is also defined as an artifact of the
        implementation.
      </p>
<p>
        For example:
      </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">cstdint</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="comment">// Here the constant 0x1FFFFFFFF has the correct suffix applied:</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">INT64_C</span><span class="special">(</span><span class="number">0</span><span class="identifier">x1FFFFFFFF</span><span class="special">);</span>
</pre>
</div>
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      Maddock<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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	26	<div class="titlepage"><div><div><h2 class="title" style="clear: both">
	27	<a name="boost_config.cstdint"></a><a class="link" href="cstdint.html" title="Standard Integer Types">Standard Integer Types</a>
	28	</h2></div></div></div>
	29	<div class="toc"><dl>
	30	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.overview">Overview</a></span></dt>
	31	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.rationale">Rationale</a></span></dt>
	32	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.ce"><span class="emphasis"><em>Caveat emptor</em></span></a></span></dt>
	33	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.exact_width_integer_types">Exact-width
	34	integer types</a></span></dt>
	35	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.minimum_width_integer_types">Minimum-width
	36	integer types</a></span></dt>
	37	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.fastest_minimum_width_integer_types">Fastest
	38	minimum-width integer types</a></span></dt>
	39	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.greatest_width_integer_types">Greatest-width
	40	integer types</a></span></dt>
	41	<dt><span class="section"><a href="cstdint.html#boost_config.cstdint.integer_constant_macros">Integer
	42	Constant Macros</a></span></dt>
	43	</dl></div>
	44	<div class="section">
	45	<div class="titlepage"><div><div><h3 class="title">
	46	<a name="boost_config.cstdint.overview"></a><a class="link" href="cstdint.html#boost_config.cstdint.overview" title="Overview">Overview</a>
	47	</h3></div></div></div>
	48	<p>
	49	The header <code class="literal"><a href="../../../../../boost/cstdint.hpp" target="_top"><boost/cstdint.hpp></a></code>
	50	provides the typedef's useful for writing portable code that requires certain
	51	integer widths. All typedef's are in namespace boost.
	52	</p>
	53	<p>
	54	The specifications for these types are based on the ISO/IEC 9899:1999 C Language
	55	standard header <stdint.h>. The 64-bit types required by the C standard
	56	are <span class="emphasis"><em>not required</em></span> in the boost header, and may not be
	57	supplied for all platforms/compilers, because <code class="literal">long long</code>
	58	is not [yet] included in the C++ standard.
	59	</p>
	60	<p>
	61	See <a href="../../../test/cstdint_test.cpp" target="_top">cstdint_test.cpp</a> for
	62	a test program.
	63	</p>
	64	</div>
65	<div class="section">
66	<div class="titlepage"><div><div><h3 class="title">
67	<a name="boost_config.cstdint.rationale"></a><a class="link" href="cstdint.html#boost_config.cstdint.rationale" title="Rationale">Rationale</a>
68	</h3></div></div></div>
69	<p>
70	The organization of the Boost.Integer headers and classes is designed to
71	take advantage of <stdint.h> types from the 1999 C standard without
72	causing undefined behavior in terms of the 1998 C++ standard. The header
73	<boost/cstdint.hpp> makes the standard integer types safely available
74	in namespace <code class="literal">boost</code> without placing any names in namespace
75	<code class="literal">std</code>. The intension is to complement rather than compete
76	with the C++ Standard Library. Should some future C++ standard include <stdint.h>
77	and <cstdint>, then <boost/cstdint.hpp> will continue to function,
78	but will become redundant and may be safely deprecated.
79	</p>
80	<p>
81	Because these are boost headers, their names conform to boost header naming
82	conventions rather than C++ Standard Library header naming conventions.
83	</p>
84	</div>
85	<div class="section">
86	<div class="titlepage"><div><div><h3 class="title">
87	<a name="boost_config.cstdint.ce"></a><a class="link" href="cstdint.html#boost_config.cstdint.ce" title="Caveat emptor"><span class="emphasis"><em>Caveat emptor</em></span></a>
88	</h3></div></div></div>
89	<p>
90	As an implementation artifact, certain C <limits.h> macro names may
91	possibly be visible to users of <boost/cstdint.hpp>. Don't use these
92	macros; they are not part of any Boost-specified interface. Use <code class="literal">boost::integer_traits<></code>
93	or <code class="literal">std::numeric_limits<></code> instead.
94	</p>
95	<p>
96	As another implementation artifact, certain C <stdint.h> typedef names
97	may possibly be visible in the global namespace to users of <boost/cstdint.hpp>.
98	Don't use these names, they are not part of any Boost-specified interface.
99	Use the respective names in namespace <code class="literal">boost</code> instead.
100	</p>
101	</div>
102	<div class="section">
103	<div class="titlepage"><div><div><h3 class="title">
104	<a name="boost_config.cstdint.exact_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.exact_width_integer_types" title="Exact-width integer types">Exact-width
105	integer types</a>
106	</h3></div></div></div>
107	<p>
108	The typedef <code class="literal">int#_t</code>, with # replaced by the width, designates
109	a signed integer type of exactly # bits; for example <code class="literal">int8_t</code>
110	denotes an 8-bit signed integer type. Similarly, the typedef <code class="literal">uint#_t</code>
111	designates an unsigned integer type of exactly # bits.
112	</p>
113	<p>
114	These types are optional. However, if a platform supports integer types with
115	widths of 8, 16, 32, 64, or any combination thereof, then <boost/cstdint.hpp>
116	does provide the corresponding typedefs.
117	</p>
118	<p>
119	The absence of int64_t and uint64_t is indicated by the macro <code class="computeroutput"><span class="identifier">BOOST_NO_INT64_T</span></code>.
120	</p>
121	</div>
122	<div class="section">
123	<div class="titlepage"><div><div><h3 class="title">
124	<a name="boost_config.cstdint.minimum_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.minimum_width_integer_types" title="Minimum-width integer types">Minimum-width
125	integer types</a>
126	</h3></div></div></div>
127	<p>
128	The typedef <code class="literal">int_least#_t</code>, with # replaced by the width,
129	designates a signed integer type with a width of at least # bits, such that
130	no signed integer type with lesser size has at least the specified width.
131	Thus, <code class="literal">int_least32_t</code> denotes the smallest signed integer
132	type with a width of at least 32 bits. Similarly, the typedef name <code class="literal">uint_least#_t</code>
133	designates an unsigned integer type with a width of at least # bits, such
134	that no unsigned integer type with lesser size has at least the specified
135	width.
136	</p>
137	<p>
138	The following minimum-width integer types are provided for all platforms:
139	</p>
140	<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
141	<li class="listitem">
142	<code class="literal">int_least8_t</code>
143	</li>
144	<li class="listitem">
145	<code class="literal">int_least16_t</code>
146	</li>
147	<li class="listitem">
148	<code class="literal">int_least32_t</code>
149	</li>
150	<li class="listitem">
151	<code class="literal">uint_least8_t</code>
152	</li>
153	<li class="listitem">
154	<code class="literal">uint_least16_t</code>
155	</li>
156	<li class="listitem">
157	<code class="literal">uint_least32_t</code>
158	</li>
159	</ul></div>
160	<p>
161	The following types are available only if, after including <boost/cstdint.hpp>,
162	the macro BOOST_NO_INT64_T is not defined:
163	</p>
164	<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
165	<li class="listitem">
166	<code class="literal">int_least64_t</code>
167	</li>
168	<li class="listitem">
169	<code class="literal">uint_least64_t</code>
170	</li>
171	</ul></div>
172	<p>
173	All other minimum-width integer types are optional.
174	</p>
175	</div>
176	<div class="section">
177	<div class="titlepage"><div><div><h3 class="title">
178	<a name="boost_config.cstdint.fastest_minimum_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.fastest_minimum_width_integer_types" title="Fastest minimum-width integer types">Fastest
179	minimum-width integer types</a>
180	</h3></div></div></div>
181	<p>
182	The typedef <code class="literal">int_fast#_t</code>, with # replaced by the width,
183	designates the fastest signed integer type with a width of at least # bits.
184	Similarly, the typedef name <code class="literal">uint_fast#_t</code> designates the
185	fastest unsigned integer type with a width of at least # bits.
186	</p>
187	<p>
188	There is no guarantee that these types are fastest for all purposes. In any
189	case, however, they satisfy the signedness and width requirements.
190	</p>
191	<p>
192	The following fastest minimum-width integer types are provided for all platforms:
193	</p>
194	<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
195	<li class="listitem">
196	<code class="literal">int_fast8_t</code>
197	</li>
198	<li class="listitem">
199	<code class="literal">int_fast16_t</code>
200	</li>
201	<li class="listitem">
202	<code class="literal">int_fast32_t</code>
203	</li>
204	<li class="listitem">
205	<code class="literal">uint_fast8_t</code>
206	</li>
207	<li class="listitem">
208	<code class="literal">uint_fast16_t</code>
209	</li>
210	<li class="listitem">
211	<code class="literal">uint_fast32_t</code>
212	</li>
213	</ul></div>
214	<p>
215	The following types are available only if, after including <boost/cstdint.hpp>,
216	the macro BOOST_NO_INT64_T is not defined:
217	</p>
218	<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
219	<li class="listitem">
220	<code class="literal">int_fast64_t</code>
221	</li>
222	<li class="listitem">
223	<code class="literal">uint_fast64_t</code>
224	</li>
225	</ul></div>
226	<p>
227	All other fastest minimum-width integer types are optional.
228	</p>
229	</div>
230	<div class="section">
231	<div class="titlepage"><div><div><h3 class="title">
232	<a name="boost_config.cstdint.greatest_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.greatest_width_integer_types" title="Greatest-width integer types">Greatest-width
233	integer types</a>
234	</h3></div></div></div>
235	<p>
236	The typedef <code class="literal">intmax_t </code>designates a signed integer type
237	capable of representing any value of any signed integer type.
238	</p>
239	<p>
240	The typedef <code class="literal">uintmax_t</code> designates an unsigned integer type
241	capable of representing any value of any unsigned integer type.
242	</p>
243	<p>
244	These types are provided for all platforms.
245	</p>
246	</div>
247	<div class="section">
248	<div class="titlepage"><div><div><h3 class="title">
249	<a name="boost_config.cstdint.integer_constant_macros"></a><a class="link" href="cstdint.html#boost_config.cstdint.integer_constant_macros" title="Integer Constant Macros">Integer
250	Constant Macros</a>
251	</h3></div></div></div>
252	<p>
253	The following macros are always defined after inclusion of this header, these
254	allow integer constants of at least the specified width to be declared: INT8_C,
255	UINT8_C, INT16_C, UINT16_C, INT32_C, UINT32_C, INTMAX_C, UINTMAX_C.
256	</p>
257	<p>
258	The macros INT64_C and UINT64_C are also defined if the the macro BOOST_NO_INT64_T
259	is not defined.
260	</p>
261	<p>
262	The C99 macro __STDC_CONSTANT_MACROS is also defined as an artifact of the
263	implementation.
264	</p>
265	<p>
266	For example:
267	</p>
268	<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">cstdint</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
269
270	<span class="comment">// Here the constant 0x1FFFFFFFF has the correct suffix applied:</span>
271	<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">INT64_C</span><span class="special">(</span><span class="number">0</span><span class="identifier">x1FFFFFFFF</span><span class="special">);</span>
272	</pre>
273	</div>
274	</div>
275	<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
276	<td align="left"></td>
277	<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
278	Maddock<p>
279	Distributed under the Boost Software License, Version 1.0. (See accompanying
280	file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
281	</p>
282	</div></td>
283	</tr></table>
284	<hr>
285	<div class="spirit-nav">
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